21"" neodymium subwoofer offers 1600Wrms (AES standard) power handling and 98dB sensitivity, 5"" high temperature Inside/Outside voice coil efficiently dissipates heat, preventing sensitivity loss through thermal compression, Double suspension and a ""multi-roll"" surround provide exceptional linearity at extremes of cone excursion, Rigid lightweight carbon fibre loaded cone delivers improved performance and faster response, Intelligent heat management in both chassis and magnet assembly design, Further minimizes distortion, SKU: TBALL10891